Gerry,
The stadium pictured is pre-1904 Polo Grounds.
Not 1909 Polo Grounds.
See the tunnel out of the field, behind Mathewson. That tunnel was filled in with seating between the 1903 and 1904 seasons. along with more seating along the field.
The Polo Grounds, as pictured behind Mathewson, did not exist after the 1903 season.
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